Usage:
Topaz Mountain Rhyolite (UT*)
Geologic age:
Tertiary*
Miocene, late*
Type section, locality, area and/or origin of name:
Named from occurrence at Topaz Mountain, Juab Co., UT (Erickson, 1963).
Designated in secs. 8, 9, 16, and 17, T. 13 S., R. 11 W., Juab Co., UT. Named from Topaz Mountain (Lindsey, 1979).
AAPG geologic province:
Great Basin province*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).